Test naming conventions in PyTest - Test Execution Trace

Test Overview

This test checks that a simple function returns the correct result and uses proper test naming conventions in pytest. It verifies that the test function name starts with test_ so pytest can discover and run it.

Test Code - pytest

PyTest

import pytest

def add(a, b):
    return a + b

def test_add_two_numbers():
    result = add(2, 3)
    assert result == 5

Execution Trace - 4 Steps

Step	Action	System State	Assertion	Result
1	Test runner starts and discovers test functions starting with 'test_'	pytest collects test_add_two_numbers from the test file	-	PASS
2	pytest runs test_add_two_numbers function	Inside test_add_two_numbers, calls add(2, 3)	-	PASS
3	Assert that result equals 5	result is 5 from add function	assert result == 5	PASS
4	Test completes successfully	pytest reports test_add_two_numbers PASSED	-	PASS

Failure Scenario

Failing Condition: Test function is not named starting with 'test_' so pytest does not run it

Execution Trace Quiz - 3 Questions

Why must pytest test functions start with 'test_'?

A So pytest can find and run them automatically

B To make the test run faster

C To avoid syntax errors

D To make tests run in parallel

Key Result

Always name your test functions starting with 'test_' in pytest so the test runner can find and execute them automatically.